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        <h2 id="序言-操作系统及语言介绍"><a href="#序言-操作系统及语言介绍" class="headerlink" title="序言 操作系统及语言介绍"></a>序言 操作系统及语言介绍</h2><h3 id="操作系统"><a href="#操作系统" class="headerlink" title="操作系统"></a>操作系统</h3><ul>
<li><p>PC</p>
<ul>
<li><p>Window</p>
<ul>
<li>图形化优势</li>
</ul>
</li>
<li><p>Linux</p>
<ul>
<li>服务器 </li>
</ul>
</li>
<li><p>Unix</p>
<ul>
<li>1970年 游戏打出来的</li>
<li>minix：大学课堂专用</li>
</ul>
</li>
<li><p>MAC</p>
</li>
</ul>
</li>
<li><p>移动端</p>
<ul>
<li>android（java）</li>
<li>IOS</li>
</ul>
</li>
<li><p>虚拟机</p>
<ul>
<li>模拟一个真实的软硬件环境</li>
</ul>
</li>
</ul>
<h3 id="语言的发展历史"><a href="#语言的发展历史" class="headerlink" title="语言的发展历史"></a>语言的发展历史</h3><ul>
<li>Java语言发展史</li>
<li>Java语言跨平台原理</li>
<li>JRE和JDK</li>
<li>JDK的下载和安装 </li>
<li><p>1.1、Java语言</p>
<ul>
<li>2009年，Sun公司被甲骨文公司收购，所以现在访问oracle官网即可：<a target="_blank" rel="noopener" href="https://www.oracle.com">https://www.oracle.com</a></li>
</ul>
</li>
<li><p>1.2、Java语言发展史</p>
</li>
</ul>
<h3 id="Java语言跨平台原理（理解）"><a href="#Java语言跨平台原理（理解）" class="headerlink" title="Java语言跨平台原理（理解）"></a>Java语言跨平台原理（理解）</h3><ul>
<li>Java程序并非是直接运行的，Java编译器将Java源程序编译成与平台无关的字节码文件(class文件)，然后由Java虚拟机（JVM）对字节码文件解释执行。所以，在不同的操作系统下，只需安装不同的Java虚拟机即可实现java程序的跨平台。</li>
<li><p>2.1、平台</p>
<ul>
<li>指的是操作系统：Windows、Mac、Linux</li>
</ul>
</li>
<li><p>2.2、跨平台</p>
<ul>
<li>Java程序可以在任意操作系统上运行。</li>
</ul>
</li>
<li><p>2.3、跨平台原理</p>
<ul>
<li>翻译作用：Java虚拟机</li>
</ul>
</li>
</ul>
<h3 id="003-JRE和JDK（记忆）"><a href="#003-JRE和JDK（记忆）" class="headerlink" title="003_JRE和JDK（记忆）"></a>003_JRE和JDK（记忆）</h3><ul>
<li>JVM（Java Virtual Machine），Java虚拟机</li>
<li>JRE（Java Runtime Environment），Java运行环境，包含了JVM和Java的核心类库（Java API）</li>
<li>JDK（Java Development Kit）称为Java开发工具，包含了JRE和开发工具</li>
<li><p>3.1、JRE（Java Runtime Environment）</p>
<ul>
<li>是Java程序的运行时环境，包含JVM和运行时所需要的核心类库。</li>
</ul>
</li>
<li><p>3.2、JDK（Java Development Kit）</p>
<ul>
<li>是Java程序开发工具包，包含JRE和开发人员使用的工具。</li>
</ul>
</li>
<li><p>3.3、JDK、JRE和JVM的关系</p>
<ul>
<li>JDK：开发环境，包含 JRE 和 开发工具。</li>
<li>JVM：保证Java程序的跨平台。</li>
</ul>
</li>
</ul>
<h3 id="机器语言"><a href="#机器语言" class="headerlink" title="机器语言"></a>机器语言</h3><ul>
<li>高电平</li>
<li>低电平 </li>
</ul>
<h3 id="汇编语言"><a href="#汇编语言" class="headerlink" title="汇编语言"></a>汇编语言</h3><ul>
<li>助记符</li>
</ul>
<h3 id="高级语言BCLP"><a href="#高级语言BCLP" class="headerlink" title="高级语言BCLP"></a>高级语言BCLP</h3><ul>
<li><p>编程语言</p>
<ul>
<li>c</li>
<li>c++</li>
<li>c# 1989</li>
<li><p>java 1995年爪哇岛（java之父）</p>
<ul>
<li><p>Java语言版本</p>
<ul>
<li>1998 1.2</li>
<li>2004 1.5</li>
<li>2009 1.7 较稳定</li>
<li>2014 1.8</li>
<li>2017 9.0</li>
</ul>
</li>
<li><p>Java语言领域</p>
<ul>
<li><p>传统软件</p>
<ul>
<li>OA：办公自动化（管理软件）</li>
<li>ERP：员工管理系统</li>
<li>CRM：客户关系管理系统</li>
<li>通讯程序</li>
<li>单机版游戏，cs架构游戏</li>
</ul>
</li>
<li><p>互联网行业</p>
<ul>
<li>金融产品管理</li>
<li>银行系统</li>
<li>移动</li>
<li>小程序</li>
</ul>
</li>
<li><p>各行业</p>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>脚本语言</p>
<ul>
<li>python 吉多</li>
</ul>
</li>
</ul>
<h3 id="计算机的基础知识"><a href="#计算机的基础知识" class="headerlink" title="计算机的基础知识"></a>计算机的基础知识</h3><ul>
<li>进制转换</li>
<li>字节介绍</li>
<li><p>DOS</p>
<ul>
<li>命令提示符</li>
<li><p>快捷键</p>
<ul>
<li>win+e 我的电脑</li>
<li>win+d 回到桌面</li>
<li>ctrl+x</li>
<li>ctrl+z</li>
</ul>
</li>
</ul>
</li>
<li><p>java源码不跨平台</p>
<ul>
<li>.class一处编译到处执行</li>
<li>关键词</li>
<li>标识符 </li>
<li>命名规范</li>
</ul>
</li>
<li><p>JDK的安装目录</p>
<ul>
<li>bin目录    包含一些用于开发Java程序的工具，例如：编译工具(javac.exe)、运行工具 (java.exe) 、打包工具 (jar.exe)等。</li>
<li>db目录    纯Java开发的数据可 Derby，是一个开源的100%Java开发的关系数据库。</li>
<li>include目录    C语言的头文件，用于支持Java程序设计。</li>
<li>jre目录    Java运行时环境的根目录。</li>
<li>jre\bin目录    包含Java平台所使用工具和类库的可执行文件和DLL文件。</li>
<li>jre\lib目录    Java运行时环境所使用的核心类库。</li>
<li>lib目录    包含开发Java程序所使用的类库文件。</li>
<li>src.zip    归档的Java源代码</li>
</ul>
</li>
</ul>
<h3 id="常量"><a href="#常量" class="headerlink" title="常量"></a>常量</h3><h3 id="变量"><a href="#变量" class="headerlink" title="变量"></a>变量</h3><ul>
<li>数据类型</li>
<li>本质原理</li>
</ul>
<h3 id="运算符"><a href="#运算符" class="headerlink" title="运算符"></a>运算符</h3><ul>
<li>算术运算符</li>
<li>四则运算</li>
<li>比较运算符</li>
<li>关系运算符</li>
<li>逻辑运算符</li>
<li><p>位运算符</p>
<ul>
<li>左移</li>
<li>右移</li>
</ul>
</li>
<li><p>三元运算符</p>
</li>
</ul>

      
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